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@article{TRSPY_1968_96_a9, author = {M. N. Yakovlev}, title = {Nonnegative solutions of boundary-value problems for quasilinear second-order equations}, journal = {Informatics and Automation}, pages = {105--110}, publisher = {mathdoc}, volume = {96}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TRSPY_1968_96_a9/} }
M. N. Yakovlev. Nonnegative solutions of boundary-value problems for quasilinear second-order equations. Informatics and Automation, Автоматическое программирование, численные методы и функциональный анализ, Tome 96 (1968), pp. 105-110. http://geodesic.mathdoc.fr/item/TRSPY_1968_96_a9/